I spent one month at Daniel's place and it definitely exceeded all of my needs.
The unit was well finished in a safe building close to Phrom Phong BTS and EmQuartier. Easy access to grocery stores and restaurants. The gym at the building was adequate for most people but if you're a serious lifter you'll want to join a nearby gym.
Daniel was an excellent host and extremely responsive. There was an issue with the aircon and he had it fixed within an hour.
In short: excellent unit, superior location, and great host. I wouldn't hesitate to stay here again the next time I'm in BKK for business.